# 1994 Proceedings of IEEE Conference on Computer Vision and Pattern Recognition

## Filter Results

Displaying Results 1 - 25 of 166
• ### Proceedings of IEEE Conference on Computer Vision and Pattern Recognition

Publication Year: 1994
| |PDF (51 KB)
• ### Recognizing object function through reasoning about 3-D shape and dynamic physical properties

Publication Year: 1994, Page(s):546 - 553
| |PDF (912 KB)

Recent work in computer vision has demonstrated positive results in reasoning about possible object function based on analysis of only the object shape. While shape properties are important, verification of actual functionality generally requires consideration of properties beyond pure static shape. In particular, dynamic physical properties such as the degree of deformation or rigidity under appl... View full abstract»

• ### Realistic range rendering

Publication Year: 1994, Page(s):848 - 851
| |PDF (332 KB)

In many model-based object recognition systems, a synthesize-and-verify technique is used to evaluate the quality of hypotheses. This technique synthesises images of hypothesized objects in hypothesized poses, and compares them against the input imagery, producing a matching score. In this paper, we examine the image synthesis process in the context of triangulation-based range finding. We motivat... View full abstract»

• ### Orientation-based representations of 3-D shape

Publication Year: 1994, Page(s):182 - 187
Cited by:  Papers (1)
| |PDF (556 KB)

Orientation-based representations are well-suited to vision tasks including viewpoint independent object recognition and 3D attitude determination. The key property that orientation-based representations share is that they rotate in the same way as the object rotates. Combinations of orientation-based representations of a model and of a sensed object determine inequalities that become equalities i... View full abstract»

• ### X-Y separable pyramid steerable scalable kernels

Publication Year: 1994, Page(s):237 - 244
Cited by:  Papers (6)  |  Patents (1)
| |PDF (680 KB)

A new method for generating X-Y separable, steerable, scalable approximations of filter kernels is proposed which is based on a generalization of the singular value decomposition (SVD) to three dimensions. This “pseudo-SVD” improves upon a previous scheme due to Perona (1992) in that it reduces convolution time and storage requirements. An adaptation of the pseudo-SVD is proposed to ge... View full abstract»

• ### The extruded generalized cylinder: a deformable model for object recovery

Publication Year: 1994, Page(s):174 - 181
Cited by:  Papers (17)
| |PDF (608 KB)

There is increasing interest in the recovery of generalized cylinders (GCs) with curved spines. However, existing formulations of such GCs, for example those based an the Frenet-Serret frame or the tube model, suffer serious drawbacks: discontinuities, a lack of expressive power, ”narrowing” in the plane normal to the spine, non-intuitive twisting behavior, and/or off-axis nonorthogona... View full abstract»

• ### Analytical studies of low-level motion estimators in space-time images using a unified filter concept

Publication Year: 1994, Page(s):229 - 236
Cited by:  Papers (1)
| |PDF (652 KB)

Low-level motion estimators based on differential, tensor and phase methods are reformulated in a unified way as filter methods in the continuous space-time domain. This approach allows inherent conceptual deficits to be distinguished from those related to the implementation in discrete space. A detailed analytical error analysis is performed. All techniques yield unbiased motion estimates for are... View full abstract»

• ### Qualitative tracking of 3-D objects using active contour networks

Publication Year: 1994, Page(s):812 - 817
Cited by:  Papers (5)
| |PDF (444 KB)

In this paper, we track changes in the appearance of the object as it moves from one frame to the next. At a symbolic level, an aspect graph clusters all the views of an object into a set of topologically distinct classes in terms of which surfaces of an object are visible from a given viewpoint (Koenderink and van Doom (1979). Two nodes (or aspects) in the aspect graph are connected by an arc if ... View full abstract»

• ### A new robust operator for computer vision: application to range data

Publication Year: 1994, Page(s):167 - 173
Cited by:  Papers (5)
| |PDF (564 KB)

The basic MINPRAN (MINimize the Probability of RANdomness) technique, introduced by C.V. Stewart (1994), is extended to handle range data taken from complex scenes. Such data often includes: (1) a large numbers of outliers, (2) points from multiple surfaces interspersed over large image regions, and (3) extended regions containing only bad data. The initial version of MINPRAN handles cases (1) and... View full abstract»

• ### Overcomplete steerable pyramid filters and rotation invariance

Publication Year: 1994, Page(s):222 - 228
Cited by:  Papers (88)  |  Patents (13)
| |PDF (588 KB)

A given (overcomplete) discrete oriented pyramid may be converted into a steerable pyramid by interpolation. We present a technique for deriving the optimal interpolation functions (otherwise called steering coefficients'). The proposed scheme is demonstrated on a computationally efficient oriented pyramid, which is a variation on the Burt and Adelson (1983) pyramid. We apply the generated steera... View full abstract»

• ### Hierarchical Gabor filters for object detection in infrared images

Publication Year: 1994, Page(s):628 - 631
Cited by:  Papers (9)  |  Patents (1)
| |PDF (384 KB)

This paper presents a new representation called “hierarchical Gabor filters” and associated novel local measures which are used to detect potential objects of interest in images. The “first stage” of the approach uses a wavelet set of wide-bandwidth separable Gabor filters to extract local measures from an image. The “second stage” makes certain spatial grouping... View full abstract»

• ### Illumination planning for object recognition in structured environments

Publication Year: 1994, Page(s):31 - 38
Cited by:  Papers (28)
| |PDF (672 KB)

This paper addresses the problem of illumination planning for robust object recognition in structured environments. Given a set of objects, the goal is to determine the illumination for which the objects are most distinguishable in appearance from each other. For each object, a large number of images is automatically obtained by varying pose and illumination. Images of all objects, together, const... View full abstract»

• ### Active stereo vision and cyclotorsion

Publication Year: 1994, Page(s):806 - 811
Cited by:  Papers (3)
| |PDF (452 KB)

When a particular point is fixated by an active stereo system different portions of the world are brought into interocular alignment. This region is known as the horoptor. Through an examination of the horoptor under different viewing conditions it is demonstrated that for certain binocular tasks it is desirable to manipulate the horoptor by rotating (torquing) the cameras about their optical axes... View full abstract»

• ### Active part-decomposition, shape and motion estimation of articulated objects: a physics-based approach

Publication Year: 1994, Page(s):980 - 984
Cited by:  Papers (33)  |  Patents (2)
| |PDF (388 KB)

We present a novel, robust, integrated approach to segmentation shape and motion estimation of articulated objects. Initially, we assume the object consists of a single part, and we fit a deformable model to the given data using our physics-based framework. As the object attains new postures, we decide based on certain criteria if and when to replace the initial model with two new models. These cr... View full abstract»

• ### A Markov random field model for object matching under contextual constraints

Publication Year: 1994, Page(s):866 - 869
Cited by:  Papers (11)
| |PDF (292 KB)

This paper presents a Markov random field (MRF) model for object recognition in high level vision. The labeling state of a scene in terms of a model object is considered as an MRF or couples MRFs. Within the Bayesian framework the optimal solution is defined as the maximum a posteriori (MAP) estimate of the MRF. The posterior distribution is derived based on sound mathematical principles from theo... View full abstract»

• ### Recovering parametric geons from multiview range data

Publication Year: 1994, Page(s):159 - 166
Cited by:  Papers (11)  |  Patents (4)
| |PDF (616 KB)

Focuses on approximating object part shapes by distinctive types of volumetric primitives. Shape approximation is accomplished by fitting volumetric models called parametric geons' to multiview range data of single-part objects and classifying the fitting residuals. Parametric geons are seven qualitative shape types defined by parameterized equations which control the size and degree of tapering ... View full abstract»

• ### Real-time feature tracking and projective invariance as a basis for hand-eye coordination

Publication Year: 1994, Page(s):533 - 539
Cited by:  Papers (19)
| |PDF (624 KB)

This article presents a methodology for using stereo visual feedback to perform manipulation tasks. The two major innovations in the approach are: 1) the use of feature-based tracking methods that perform in real-time on standard workstations without specialized hardware; and 2) the use of closed-loop feedback control based on projective invariants to make positioning accuracy independent of hand-... View full abstract»

• ### Motion estimation and vector splines

Publication Year: 1994, Page(s):939 - 942
Cited by:  Papers (38)  |  Patents (2)
| |PDF (312 KB)

Many formulations of visual reconstruction problems (e.g. optic flow, shape from shading, biomedical motion estimation from CT data) involve the recovery of a vector field. Often the solution is characterized via a generalized spline or regularization formulation using a smoothness constraint. This paper introduces a decomposition of the smoothness constraint into two parts: one related to the div... View full abstract»

• ### A survey of motion analysis from moving light displays

Publication Year: 1994, Page(s):214 - 221
Cited by:  Papers (18)  |  Patents (1)
| |PDF (740 KB)

Motion-based recognition deals with the recognition of objects or motions directly from the motion information extracted from a sequence of images. There are two main steps in this approach. The first consists of finding an appropriate representation for the objects or motions, from the motion cues of the sequence, and then organize them into useful representations. The second step consists of the... View full abstract»

• ### Nonlinear diffusion of scalar images using well-posed differential operators

Publication Year: 1994, Page(s):92 - 97
| |PDF (488 KB)

In recent years several nonlinear diffusion schemes have been introduced. We discuss the numerical implementation of a number of current nonlinear evolution schemes, using the notion of well-posed differentiation by Gaussian kernels. The infinitesimal change of an image when increasing scale depends on the local differential invariants evaluated at the scale of the image considered, i.e. on terms ... View full abstract»

• ### Shape analysis of brain structures using physical and experimental modes

Publication Year: 1994, Page(s):752 - 755
Cited by:  Papers (12)
| |PDF (396 KB)

We present a framework for analyzing the shape of structures within the human brain. A mathematical model is developed describing the deformation of any brain structure whose shape is affected by both gross and detailed physical processes. The total shape deformation is decomposed into physical modes of variation obtained from finite element analysis, and experimental modes of variation obtained f... View full abstract»

• ### Medium level scene representation using a VLSI smart hexagonal sensor with multiresolution edge extraction capability and scale space integration processing

Publication Year: 1994, Page(s):632 - 637
Cited by:  Papers (1)  |  Patents (1)
| |PDF (588 KB)

This paper presents a sensing approach where photo-transduction, multi-resolution feature extraction, scale-space integration and edge tracking are performed on a mixed (digital-analog) VLSI architecture in order to generate medium-level scene description. The proposed system is mainly targeted for robot vision applications where feature description is preferred to a set of raw or raster 2D images... View full abstract»

• ### On the relative brightness of specular and diffuse reflection

Publication Year: 1994, Page(s):369 - 376
Cited by:  Papers (14)
| |PDF (760 KB)

Inhomogeneous dielectric surfaces exhibit both diffuse and specular reflection components. While various reflection models have been proposed for both of these components, the prediction of the relative strengths of these components in computer vision and computer graphics has so far not had a strong physical motivation. We propose in this paper a reflectance model for combined diffuse and specula... View full abstract»

• ### Salient structure analysis of fluid flow

Publication Year: 1994, Page(s):310 - 315
Cited by:  Papers (7)
| |PDF (452 KB)

This paper presents a framework for analyzing salient patterns (vortex structures) in the velocity fields of turbulent fluid flows. Vortices are modeled as rotational motions in the velocity fields and concentrations in the corresponding vorticity fields. A pointwise linear model is then built to approximate the kinematics of the flow field. Locally, the vector fields are analyzed in terms of flui... View full abstract»

• ### Optimal estimation of 3D structures using visual servoing

Publication Year: 1994, Page(s):347 - 354
Cited by:  Papers (6)
| |PDF (576 KB)

This paper deals with the recovery of 3D information using a single mobile camera in the context of active vision. We propose a general revisited formulation of the structure-from-motion issue, and we determine adequate camera configurations and motions which lead to a robust and accurate estimation of the 3D structure parameters. We apply the visual servoing approach to perform these camera motio... View full abstract»